Nothing will live if you don't keep the prop in the water!
Heat is also a major factor of failer. A drive shower will help greatly for long 20 mile runs at WOT.
At this exact moment I have a stock drive on my boat with 900 HP going through it. I ran it for my last few trips of the 03' seasone and had no problems. I do not push it past 85/90 in good water and drive it like there is a egg under the petal ("Shawn Torrez").
Bravo ones can be kept alive it just takes the fun out of it...
SandBarJunkies has the bravo and a 496HO in a Mach 26, he runs wide open everywhare at 70/75 and has had no problems..
Just my .02
Timmy